Moonrise Geography
Global topocentric altitude, azimuth, instantaneous sub-lunar zenith coordinate, and local horizon visibility across worldwide meteorological stations.
GEOGRAPHIA ORTUS LUNAE · GUIDED TOPOCENTRIC SWEEP
The Moon moves. The horizon translates.
Follow one lunar coordinate as it becomes a different sky at every station on Earth.
01 · SUB-LUNAR ZENITH
At one point on Earth, the Moon is overhead.
The sub-lunar point is the moving place where the Moon crosses the local meridian at 90° altitude. Every other observer measures distance from that moving center.
Local horizon sample
Greenwich
Below Horizon (Invisible) · azimuth 95°
The UTC sweep recomputes the sub-lunar field and every station from the same topocentric solver.
The Moon from here.
One Moon. A different horizon at every longitude.
Map source & calculation notes
Natural Earth contributors; Tom Patterson and Nathaniel Vaughn Kelso. Public Domain. Natural Earth 4.1.0 geography redistributed by world-atlas. Equirectangular projection with antimeridian clipping; generalized coastlines, not navigation-grade.
Coordinates: Astronomy Engine, apparent equator of date. Station altitudes use observer-specific parallax and standard refraction at sea level. Snapshot refreshes each minute while this page is visible.
Natural Earth usage terms ↗